Show static functions in the object function list

[D8H]

Description

Context

• Some actions and conditions that applies to objects are defined statically.

Actual

• These functions don’t appear on the function list for objects.

Expected

• These functions should appear on the function list for objects.

User story

• The user wants to link 2 objects.
• The user selects the 1st object to link.
• The user finds the "Link 2 objects" action in the object action list.

Solution suggested

The editor could look at the object and behavior parameters to add the static function in the object function list.

Alternatives considered

Restrict it to only object parameters that are the 1st visible one?

[4ian]

There are a few special cases that are listed in this file: https://github.com/4ian/GDevelop/blob/master/newIDE/app/src/InstructionOrExpression/EnumerateInstructions.js - would it be enough to apply the same thing for the linked objects condition?

[D8H]

There are a few special cases that are listed in this file: https://github.com/4ian/GDevelop/blob/master/newIDE/app/src/InstructionOrExpression/EnumerateInstructions.js - would it be enough to apply the same thing for the linked objects condition?

Ok, It should work for this.
I forgot to explain it in the description, but what about event based functions? Do you think it must be explicitly chosen by the person writing the extension?

[4ian]

Yeah not sure about these. Might be worth adding a flag in the instruction metadata in the future to "consider as object instruction". So we could expose it in extensions directly.